SN65DSI86: use as a standard MIPI DSI to VESA DP bridge

Comi

DSI86 can support MIPI DSI to DP as well. 

Most DP monitors do not support ASSR. If this is the case, DSI86’s ASSR will need to be disabled by making ASSR_CONTROL read/write instead of read-only. The first step to make ASSR_CONTROL read/write is to make sure TEST2 pin is be sampled high at the rising edge of EN pin. It is recommended to pull TEST2 pin to 1.8V thru a 1k to 10k resistor. Once TEST2 is high, the following steps must be performed:

1. Write 0x07 to register 0xFF. This will select Page 7.
2. Write 0x01 to register 0x16. This will make ASSR_CONTROL to be read/write.
3. Write 0x00 to register 0xFF. This will select Page 0.
4. Write 0 to bits 1:0 at register 0x5A. This will change from ASSR to Standard DP.

Thanks

David